[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.113536] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.012897] random: sshd: uninitialized urandom read (32 bytes read) [ 27.392377] random: sshd: uninitialized urandom read (32 bytes read) [ 27.880371] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. [ 33.709510] urandom_read: 1 callbacks suppressed [ 33.709514] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/23 05:08:26 parsed 1 programs [ 35.133477] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/23 05:08:28 executed programs: 0 [ 36.143526] IPVS: Creating netns size=2536 id=1 [ 36.264012] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 36.276411] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 36.319071] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 36.330315] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 36.373811] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 36.385803] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 36.397283] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 36.418385] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 36.912242] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 36.937052] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 36.943379] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 36.950091] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 37.154926] hrtimer: interrupt took 19832 ns [ 37.199831] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 37.220036] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 37.270323] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 37.326971] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 37.364166] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 37.372494] IP: [] l2tp_session_create+0xc60/0x16f0 [ 37.379283] PGD 1c8fdb067 [ 37.381931] PUD 1da119067 PMD 0 [ 37.385417] [ 37.387040] Oops: 0002 [#1] PREEMPT SMP KASAN [ 37.391613] Dumping ftrace buffer: [ 37.395132] (ftrace buffer empty) [ 37.399006] Modules linked in: [ 37.402295] CPU: 1 PID: 4136 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31 [ 37.409887] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.419316] task: ffff8801d7896000 task.stack: ffff8801d6c98000 [ 37.425349] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 37.434462] RSP: 0018:ffff8801d6c9fab0 EFLAGS: 00010246 [ 37.439987] RAX: 0000000000000000 RBX: ffff8801d6e42500 RCX: 1ffff1003af12d1d [ 37.447237] RDX: 1ffff1003b440f00 RSI: ffff8801d78968c8 RDI: ffff8801da207800 [ 37.454589] RBP: ffff8801d6c9fb50 R08: ffff8801d78968e8 R09: 0000000000000000 [ 37.461838] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da2076d8 [ 37.469086] R13: 0000000000000000 R14: ffff8801da207680 R15: ffff8801d6c9fc68 [ 37.476333] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f773fb40 [ 37.484536] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 37.490461] CR2: 0000000000000080 CR3: 00000001da2d2000 CR4: 00000000001606f0 [ 37.497715] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.504962] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.512205] Stack: [ 37.514330] 0000000000000201 ffffffff836ca141 ffff8801d6c9fad0 ffffffff81237f0d [ 37.522326] ffff8801da207680 ffff8801d6e42658 ffff8801da2076d8 ffff8801d6e42650 [ 37.530341] ffff8801d6e425b0 ffff8801da2076a0 0000000000000000 0000000000000000 [ 37.538449] Call Trace: [ 37.541017] [] ? l2tp_session_get+0x1d1/0x790 [ 37.547144] [] ? trace_hardirqs_on+0xd/0x10 [ 37.553111] [] pppol2tp_connect+0x10d7/0x18f0 [ 37.559296] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 37.565514] [] ? security_socket_connect+0x8f/0xc0 [ 37.572079] [] SYSC_connect+0x1b8/0x300 [ 37.577691] [] ? SYSC_bind+0x280/0x280 [ 37.583207] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 37.590199] [] SyS_connect+0x24/0x30 [ 37.595543] [] ? SyS_accept+0x30/0x30 [ 37.601062] [] do_fast_syscall_32+0x2f7/0x870 [ 37.607192] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.613834] [] entry_SYSENTER_compat+0x90/0xa2 [ 37.620114] Code: 00 00 49 8d be 80 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 7b 09 00 00 49 8b 86 80 01 00 00 ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 [ 37.647196] RIP [] l2tp_session_create+0xc60/0x16f0 [ 37.653970] RSP [ 37.657614] CR2: 0000000000000080 [ 37.661588] ---[ end trace f457d35eb14c4ffb ]--- [ 37.666620] Kernel panic - not syncing: Fatal exception [ 37.672381] Dumping ftrace buffer: [ 37.675920] (ftrace buffer empty) [ 37.679674] Kernel Offset: disabled [ 37.683285] Rebooting in 86400 seconds..